Mercury MerCruiser Quicksilver Washer 20572 | 0.390″ × 0.750″ × 0.093″
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Mercury / MerCruiser Quicksilver Washer 20572
Part Number: 20572 | Service Format: 12-20572 | Inside Diameter: 0.390 in. | Outside Diameter: 0.750 in. | Thickness: 0.093 in.
Genuine Mercury / MerCruiser OEM flat washer catalogued as 12-20572. The 12-prefix in Mercury’s numbering system identifies sealing and load-bearing washers where dimensions — inside diameter, outside diameter, and thickness — are critical to correct clamp load and sealing in the assembly. Always confirm the part number in your Mercury parts diagram before ordering; a washer that is close but not exact in any dimension can affect fastener performance in a marine environment.
Specifications
- Brand: Mercury / MerCruiser / Quicksilver
- Part Number: 20572
- Service Format: 12-20572
- Type: OEM flat washer
- Inside Diameter (ID): 0.390 in. (9.91 mm)
- Outside Diameter (OD): 0.750 in. (19.05 mm)
- Thickness: 0.093 in. (2.36 mm)
- Weight: ~0.1 oz per washer
- Superseded By: No confirmed newer OEM superseding number identified
- Systems: Used in Mercury outboard and MerCruiser sterndrive / inboard assemblies where 12-20572 appears on the parts diagram
Compatible Applications
Fitment must be confirmed against the Mercury parts diagram for your specific engine model and serial number. 20572 is shared hardware — its location varies by assembly. Confirm the diagram part number, not just dimensions, before ordering.
- Mercury outboard assemblies where 12-20572 is specified in the parts diagram
- MerCruiser sterndrive and inboard assemblies where 12-20572 is specified in the parts diagram
- Sealing, load-distributing, and spacing applications in engine, drive, and mounting hardware where exact ID, OD, and thickness are required
When to Replace
- Washer is crushed, deformed, or no longer sitting flat
- Center hole is worn or elongated
- Seating surface is corroded, pitted, or damaged
- Assembly is being opened for service — best practice is to replace any washer disturbed during disassembly, especially in water-exposed or high-load positions
Installation Notes
- Clean mating surfaces and the fastener hole before installation
- Confirm correct orientation if the washer has a specific seating direction in the diagram
- Replace any related seals or gaskets that were disturbed during disassembly
- Torque the fastener to the Mercury service manual specification for the exact assembly — do not use a generic torque value
- Do not substitute a generic hardware-store washer — OEM dimensions and material specification matter for proper clamp load in marine assemblies
Related Parts & Service Items
- Mercury Quicksilver Washer 20583 — adjacent washer in the Mercury 20xxx series
- Mercury MerCruiser Quicksilver Washer 20533 – Pack of 5
- Mercury MerCruiser Quicksilver Seawater Pump Washer 20084 – Pack of 5
- Mercury MerCruiser Quicksilver Washer 12-56085
- Mercury MerCruiser Flat Washer 2-Pack — 12-44164
Parts Desk Insights
Best use case: 20572 is the right washer when your Mercury or MerCruiser parts diagram specifically calls out 12-20572 and you need an OEM-spec fit. This is not a part to swap generically — the combination of 0.390″ ID, 0.750″ OD, and 0.093″ thickness is what Mercury engineered for the clamp load and sealing requirements of the positions where it appears.
Common customer issue: Ordering by a single dimension (usually OD) and receiving a washer that looks right but has a different ID or thickness. In load-bearing or sealing positions, even a small dimensional mismatch can affect how a fastener seats or how well a joint seals. Pull up the diagram for your engine, confirm all three dimensions match 12-20572, and if you’re unsure, our parts desk can help you cross-reference before you order.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.